Lochinvar & A.O. Smith 100233264 Bulbwell

The Lochinvar 100233264 Bulbwell is a precision-engineered immersion well designed for accurate temperature sensing in commercial boilers and water heaters. As a direct OEM replacement part, this component ensures the aquastat sensor or thermostat bulb is properly isolated from the high-pressure system fluid while maintaining optimal thermal conductivity. This specific model is functionally identical to Lochinvar TST2301 and TST2301K, providing a seamless fit for A.O. Smith water heater repair and maintenance. Constructed from high-grade copper or brass, the 100233264 bulbwell resists corrosion and mineral buildup, preventing sensor drift and ensuring the control system receives precise data. For contractors servicing high-efficiency hydronic systems, using this genuine HVAC sensor well is critical for maintaining system calibration and preventing leaks at the insertion point. It is compatible with a wide range of Lochinvar Knight and A.O. Smith Cyclone models requiring a standard thermostat bulb well.

Key Benefits

• Exact OEM Match: Drops directly into existing tapping, replacing 100233264, TST2301, and TST2301K without modification.
• Thermal Efficiency: Optimized wall thickness allows for rapid heat transfer to the temperature sensing bulb for responsive cycling.
• Pressure Integrity: Engineered to withstand standard commercial operating pressures, protecting sensitive electronics from system water.
• Broad Compatibility: Supports various Lochinvar and A.O. Smith boiler parts configurations across multiple product generations.

Common Questions

What is the difference between 100233264 and TST2301?
There is no functional difference; these are interchangeable part numbers for the same Lochinvar bulbwell assembly.

Does this well include the heat transfer paste?
This listing is for the physical well; however, applying a thermal conductive compound is recommended during installation to eliminate air gaps between the bulb and the well interior.

Which thermostat bulbs fit inside this immersion well?
This well is designed for standard 3/8-inch or 1/2-inch diameter sensing bulbs commonly found on commercial aquastat controllers and limit switches.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.